The electrooxidation behavior of piperonal(PI) and isosafrole (ISF) on roughened platinum in nonaqueous system was investigated by cyclic voltammogram(CV) and in-situ surface enhanced raman scattering (SERS) spectroscopy. On the one hand, PI would be oxidated to piperic acid if the potential was equal to 1.50 V or higher than 1.50 V. On the other hand, the in-situ SERS results demonatrated that the exciting laser of 632.8 mn promoted the electrooxidation of PI at the oxidation potential (>= 1.50 V). As a result, the potential which was to directly oxidate ISF to PI should be controlled between 1.20 V and 1.50 V
